Attachment to boiler and other furnaces.



C-SCHNEIDER- ATTACHMENT T0 BOILER AND OTHER FURNACES.

APPLICATION FILED MAR.9. 1914- Patented July 11, 1916.

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C. SCHNEIDER. ATTACHMENT T0 BOILER AND OTHER FURNACES.

APPLICATION FILED MAR. 9. 1914.

Patented July 11, 1916.

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CHRISTIAN SCHNEIDER, OF'SHEIEFIELD, ENGLAND.

ATTACHMENT TO BOILER AND OTHER FURNACES.

Specification of Letters Patent. I

Application filed March 9, 1914. Serial No. 823,631.

To all whom it may concern:

Be it known that I, CHRISTIAN SCHNEI- DER, of the city of Sheffield, inthe county of Yorkshire, England, have invented certain new and usefulImprovements in Attachments to Boiler and other Furnaces, of which thefollowing is the Specification.

The invention relates to attachments to boiler and other furnaces andthe object of the invention is to provide a simple and eflicient devicefor supplying air to the combustion chamber of boiler furnaces for thepurpose of consuming smoke within the furnace, the device when installedprovidlng for the quicker generation of steam than can be done inordinary circumstances also for effecting the extracting and consumptionof the combustible gases and as far as possible the carbon or coke wherecoal is used as a fuel, this latter feature effecting economy in fuel.

With the above objects in View the invention consists essentially inmeans for admitting a steam jet into the furnace from the front andabove the grates and means for admitting a forced air draft to thefurnace at the back from beneath the grates, the jet and air draft soprovided effecting a baffling of the smoke in the furnace ,and theconsequent consumption of the com- Figure 1 represents a front .view ofpart of a furnace with my invention applied. Fig. 2 is a longitudinalsectional view through the furnace. Fig. 3 is an enlarged detailedvertical sectional view through the furnace, the section being taken inthe plane denoted by the line aa-m Fig. 2. Fig. 4 is a side view of thecombination air bOX and bridge. Fig. 5 is a plan view of the air box andbridge. Fig. 6 is a vertical sectional view through the air box andbridge. Fig. 7 is an enlarged detailed vertical sectional view throughone of the steam nozzles, the section being taken in the plane denotedby the line Y -Y Fig. 1. Fig. 8 is an enlarged' detailed sectional viewthrough the cross plate showing the controlling rod passing through thesame.

In the drawings like characters of reference indicate correspondingparts in each figure.

1 represents the boiler, 1 the front end plate, 2 the furnace, 3 theflue, 1 the grate bars, 5 the ashpit, 6 the furnace end plate and 7 thefurnace door, the door being hinged to the end plate at 8 as iscustomary.

9 is a cross plate permanently secured to the lower edge of the frontplate which it will be noticed terminates at a short distance beneaththe furnace door. This cross plate carries a damper 10 which controlsthe entrance to the'ashpit, the damper being connected to the crossplate by hinges 11.

12 is a steam pipe leading from the top of the boiler and provided witha T-connec tion from which I pass a feed pipe 14, the said'feed pipebeing supported in any suitable way from the cross plate and passinglengthwise of the same and being fitted with a plurality of steamnozzles l5which project into the furnace through suitable air openings16 provided in the cross plate. Air tubes 17 surround the nozzles andare secured to the inner face of the plate,the openings in the tubesbeing continuous with the air inlet openings 16. It is to be noticedthat these nozzles and air tubes are located at the front beneath thegrates. The pipe 14 is supplied with a controlling valve 18.

.19 is a chain connected to the damper and having any one of the linksthereof connected to a hook 20 carried by the cross plate. The positionof the damper can be adjusted by means of the chain and hook.

21 is a second branch steam pipe connected to the T-piece 13 and havingthe lower end thereof passing through the end plate 6 directly above thedoor, the said end terminating in a contracted nozzle 22. 23 is a strapfastening the lower end of the pipe to the end plate 6 and 21' is acontrolling valve located in the pipe 21. It is to be noted that thislatter nozzle is well above the grates. The forward end of the gratebars are supported in the usual way from the door frame structure whilethe rear ends are mounted on a special cross bar 25 which I provide. 26is a second cross bar located immediately to the rear of the cross bar25 and spaced from curvature of the sides of the furnace.

27 is a baflie wall formed from fire bricks,' which baffle wall is builtup in the furnace to the rear of the cross bar 26 and has the upper facethereof horizontal and directly opposite the upper face of thelatterbar.

28 is a combined air box and bridge having the front side thereofmounted on the bars and the rear side mounted on the baffle wall. Thisair box and bridge is formed in the special manner now described. Itcomprises essentially three parts, a bed plate 29, a box like structure30 and a damper 31.

The bed plate is supplied with a damper opening 32 which receivespivotally the damper 31 and is provided further with pairs of upstandingstops or lugs 33 located to the sides of the damper opening which lugsreceive between them the lower edge of the box like structure 30, therebeing sulficient clearance to allow of expansion and contraction. Thebed plate lies on the bars and baffle wall with the ends of the platebutting against the interior walls of the furnace, particular care beingtaken in settin it so that the damper is free to operate in 51c open.space reserved between the cross bar 26 and the wall 27. The box likestructure 30 has the sides and ends thereof tapering slightly upwardlyso that the opening at the top is somewhat contracted. The box issomewhat shorter and narrower than the bed plate so that fire brick canbe built up around the box to inclose the same, the fire brick 34Lresting on the bed plate. The upper or outlet end of the box'extendswell above the level of the grates.

The damper is provided with an extending eye bolt 35 connected to acontrolling rod 36 which passes forwardly'beneath the grates and througha suitable opening formed in the cross plate 9.

The forward end of the bar is provided with a handle and is fitted alsoat the lower edge with teeth 37 whereby the rod and consequently thedamper can be adjusted, the teeth being arranged to engage with the sideof the opening in the plate.

V] hen the device is used steam is turned on by opening the valves 18and 24:. Thesteam issuing through the nozzles 15 causesa forced airdraft beneath the grates the air entering through the air tubes 17 Partof this air passes through the grates and supports combustion, whilesome of it passes rearwardly to the box and through the same to the backof the furnace, the supply through the box being controlled by thedamper, which can be set by the attendant as required by manipulatingthe rod. The steam admitted above the fire through the jet 22 operatesto baffle the smoke rising from the fire. In actual practice this jet isdirected to the upper edge of the air box.

The products of combustion, by the combined effect of the top steam jetabove the fire and the air draft through the air box at the back of thefire, are bafl'led and retained above the fire with the result that thecombustible material is burned before escaping to the flue over the airbox. Sufficient oxygen is supplied by the top steam jet and by the airadmitted at the back to insure complelte combustion of the combustiblemateria It will be seen that the wall 27 forms not only a support forthe box but also prevents any air entering the flue except by way of theair box.-

I might here mention that in boilers with a small furnace and in thosethat are worked at low pressure it is unnecessary to supply the air boxas the nozzle ,22 in combination with the nozzles 15 and air tubes 17will supply suificient air to consume all the smoke rising from thefire, the jet 22 acting to baffie down the smoke rising from the fireand retaining it in close proximity to the flame of the fire until it isconsumed. However in steam boilers with large furnaces and in those thatare worked at high pressure I find it necessary to provide thecombination bridge wall and air box at the back. The air entering theback of the furnace through the box meets and consumes any possiblesmoke which may not havebeen consumed by the action of the air and steamjets in the furnace.

hat I claim as my invention is:

In a boiler, the combination with a furnace provided with the usualfront plate, entry door and grate bars, of a cross plate secured to thefront end of the furnace beneath the front plate and door, said crossplate being supplied with a plurality of air inlet openings, tubescarried by the cross plate and continuous with the openings, said tubesentering the furnace beneath the grate, a steam pipe. leading from thetop of the boiler and passing lengthwise of the cross plate, steamnozzles secured at intervals to the pipe and passing into the tubesaforesaid, a controlling valve in the feed pipe, an adjustable dampercarried by the cross plate, a second steam feed pipe communicating withthe boiler and passing to the front end of the furnace, a steam nozzleentering the furnace at apoint above the door, said noz- Zlecommunicating with the latter steam pipe and. a valve in the said lattersteam pipe, as and for the purpose specified.

Signed at Winnipeg this 14th day of October, 1913.

CHRISTIAN SCHNEIDER. In the presence of G. S. ROXBURGH, S. Sorrwnnr.

Copies otthis patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, .D. C. i

